companies_controller.rb

class CompaniesController < ApplicationController
  STORE = Company
  
  def new
    form = CRM.new_company_form
    render locals: { form: form }
  end

  def create
    status = CRM.create_company(params[:company], STORE)

    if status.success?
      redirect_to admin_companies_path, notice: "La empresa ha sido creado exitosamente."
    else
      render :new, locals: { form: status.form }
    end
  end
end

create_company_spec.rb

require_relative "spec_helper"

module CRM
  RSpec.describe "Create company" do
    def new_company_form
      CRM.new_company_form
    end

    def create_company(params, store)
      CRM.create_company(params, store)
    end

    attr_reader :store, :params, :logo

    before do
      @store = DummyStore
      @params = { "name" => "D1", "logo" => @logo = Object.new }
    end

    it "has a form" do
      form = new_company_form
      expect(form.name).to eq nil
      expect(form.logo).to eq nil
    end

    describe "creates a record adding the slug" do
      example do
        expect(store).to receive(:create).with(name: "D1", logo: logo, slug: "d1")
        create_company(params, store)
      end

      example do
        name = "uno Dos trEs"
        slug = "uno-dos-tres"
        expect(store).to receive(:create).with(name: name, logo: logo, slug: slug)
        create_company(params.merge("name" => name), store)
      end
    end

    it "returns success" do
      status = create_company(params, store)
      expect(status).to be_success
    end

    describe "without name" do
      it "does not returns success" do
        status = create_company({}, store)
        expect(status).not_to be_success
      end

      it "does not creates the record" do
        expect(store).not_to receive(:create)
        create_company({}, store)
      end

      it "returns a blank error" do
        status = create_company({}, store)
        expect(status.form.errors[:name]).to eq ["no puede estar en blanco"]
      end
    end
  end
end